The function `is_in` checks if the first argument can be found in the second argument.

## Arguments

### `[arg1 arg2]`

```
is_in [arg1] [arg2]
```

### Example

Use `is_in` as a function under your pipeline definitions:

```yaml
pipelines:
  dev:
    run: |-
      is_in apples "apples peaches"
```
Returns exit status 0

```yaml
pipelines:
  dev:
    run: |-
      is_in apples "peaches bananas"
```
Returns exist status 1 (fatal)
